Intruder Alarms

Secure your home or business with an approved SIA intruder alarm system.

Fire Systems

The installation of a reliable, high quality fire detection system within your business is crucial.


CCTV is a "must have" element of a security solution within your home and business.

Access Control

An access control system can be the first line of defence in preventing unauthorised access or activity.

Fibre Optic

We offer Network and CCTV solutions over Fibre Optic cable.

Network/IT Solutions

We design and install bespoke networks to suit your business needs.


Biometric finger print and iris readers available for an enhanced level of security.

Time & Attendance

Manage your staff more efficiently with a time & attendance solution with integrated payroll options.

Who We Are

We are Stewart Intruder Alarms (NI) Ltd, is Ireland's longest established security installers.

We are one of Ireland's most well established security companies, based in Carryduff Co.Down with over 45 years of experience and expert knowledge in the Security and IT sector you can be sure you are making the right choice with SIA. Our specialised security consultants can design a system around your needs catering for all sectors Domestic, Commercial and Industrial, followed by a professional installation executed by our qualified security engineers, we ensure your requirements are met throughout from consultation to installation.

What We Do

Systems we can offer your home or business..

  • Intruder Alarms
  • Fire Systems
  • CCTV/IP Cameras
  • Access Control Systems
  • Network/IT Solutions & Repairs
  • Fibre Optic Installations
  • Time & Attendance
  • Biometrics
  • Disabled Refuge
  • Nurse Call

What People Are Saying

Testimonials from our clients

  • "Very professional, i feel secure knowing i have a monitored Intruder Alarm with SIA"

    Mrs G.Martin, Belfast
  • "SIA and their team of technicians were able to upgrade and maintain our Fire Alarm system when other companies couldn't"

    Mr D.Herron, Schrader Electronics
  • "I came to SIA for a customised Time & Attendance management system for Our restaurants, they delivered a bespoke system which I could access remotely and integrate into our payroll. This reduced my hours on site"

    Mr L.McQuoid, Restaurants